The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. what is the probability that a pregnancy last at least 300 days? round to four decimal places. a. 0.0164 b. 0.9834 c. 0.4834 d. 0.0179

A. 0.0164

Step-by-step explanation:

Given : The lengths of human pregnancies are normally distributed with a mean

Standard deviation :

Let X be the random variable that represents the length of pregnancy of a randomly selected human .

z-score :

For X = 300

Now, the probability that a pregnancy last at least 300 days will be :-

Hence, the probability that a pregnancy last at least 300 days =0.0164

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.